A balloon contains Helium, Neon, Argon, and Krypton gases. The pressure of the balloon is 1000 kPa. The following pressures are known: PHe = 350 kPa, PNe = 220 kPa, and PAr = 70 kPa. Determine the pressure of krypton in the balloon.

Answer: Volcanic Eruptions

Explanation:

Answer:

1. joystick 2. scroll wheel 3. shutdown

The mass percent of a sodium fluoride solution prepared by dissolving 0.64 moles of sodium fluoride into 63.5 grams of water is 29.7%.

Mass percent is a means to describe a component in a specific combination or to convey a concentration. The mass percentage used to describe the solution composition indicates the mass of solute contained in a given mass of solution.

To determine the mass percent of an element in a compound, we divide the mass of the element in one mole of the compound by the compound's molar mass and multiply the result by 100.

Given:

Number of moles = 0.64 moles

Moles of sodium fluoride = Given mass/molar mass

0.64 moles = Mass / 42

Mass = 26.88gram

Mass % = Mass of solute/ mass of solution × 100

= 26.88/90.48 × 100

= 29.7 %

Thus, 29.7 % is the mass percent of a sodium fluoride solution prepared by dissolving 0.64 moles of sodium fluoride into 63.5 grams of water

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Batteries come in all shapes and sizes, and depending on the type of battery, the minerals that compose them are mainly lithium, cobalt, graphite, nickel and manganese.

Answer:

The mass is 12.0107 but it rounds up to 12

Answer:

Melting

Explanation:

Once heat is added it will turn to a liquid

Melting is the process of turning solid to liquid.

Answer:

1kg/ml

Explanation:

The cube root of a number is the reverse of the cube of a number and it can be found by prime factorization method. The cube root of 8000 is 20.

Prime Factorization is the finding which prime numbers multiply together to make the original number. A prime number is a natural number greater than 1 that is not a product of two smaller natural numbers. A natural number greater than 1 that is not prime is called a composite number.

Prime factorization of 8000 is 2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5

Simplifying the above expression: \(2^{6}\) * \(5^{3}\)

Simplifying further: \(20^{3}\)

Therefore, the cube root of 8000 by prime factorization is (2 × 2 × 2 × 2 × 2 × 2 × 5 × 5 × 5)1/3 = 20.

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The mass of the balloon decreases as the release of hydrogen gas.

If the balloon had expanded more then the mass of hydrogen gas will increase inside the balloon but the mass of the balloon decreasing because the hydrogen gas escape from the system means from the balloon.

There is less percent change in the mass of the balloon while on the other hand, the concentration of hydrogen gas increases inside the balloon which leads to expansion of balloon so we can conclude that the mass of the balloon decreases as the release of hydrogen gas.

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Felting is a physical procedure. The mixture of the given solid and the liquid can be separated using filter paper in this process, for example, sand and water can be separated using filter paper.

Filtration is the process of removing solid particles from a liquid or gaseous fluid by using a filter medium that allows the fluid to pass through but retains the solid particles. The desired product could be either the clarified fluid or the solid particles removed from the fluid.

Separating sand from water is a physical process rather than a chemical one. Sand and water are a mixture that can be easily separated without the use of any chemicals. Sand can be filtered out of the water with a sieve and then dried to allow any remaining water to evaporate.

Thus,Water and sand are being separated by filtration.Felting  is used as a physical change.

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Labels and SDS provide the same amount of information about chemicals. The answer is B) False.

Labels and Safety Data Sheets (SDS) provide different types and amounts of information about chemicals. Labels typically include basic information such as the product name, manufacturer, hazardous ingredients, and warning statements about potential hazards. Labels usually provide concise, essential information about a chemical, including hazard warnings, product identification, and first aid measures. SDS, on the other hand, provide more comprehensive information about a chemical including physical and chemical properties, health hazards, first aid measures, handling and storage precautions, and emergency procedures. In fact, SDS can be dozens of pages long and provide much more detailed information than a label alone. It's important to read both the label and SDS to fully understand the hazards associated with a chemical and how to handle it safely.
Labels and Safety Data Sheets (SDS) both provide important information about chemicals, but they differ in the amount and type of details they offer.

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A first-order reaction refers to a reaction in which the rate of the reaction is directly proportional to the concentration of a single reactant raised to the first power and is expressed as it would take approximately 46.4 minutes for the 80% completion of this first-order reaction to occur. 46.4 minutes.

Rate = k[A]

In this equation, k is the reaction rate constant, and [A] represents the concentration of reactant A.

The half-life of a reaction of the first order completes in 10 minutes. We need to find out how much time will be needed for the 80% completion of this reaction.

To solve for the time needed for 80% completion of a reaction of the first order, we need to use the formula:

Time for 80% completion = 2.303/k x log ([A]₀/[A]t)

where k is the reaction rate constant, [A]₀ is the initial concentration of the reactant and [A]t is the concentration of the reactant after the given time t, and 2.303 is a conversion factor.

Let [A]₀ = 1 and [A]t = 0.2 (since 80% completion means 20% of the original concentration remains)

We know that, t1/2 = 10 min;

therefore, k = 0.693/t1/2

= 0.693/10

= 0.0693 (as 0.693 = ln2)Now,

Time for 80% completion

= 2.303/k x log ([A]₀/[A]t)

= 2.303/0.0693 x log(1/0.2)

= 46.4 minutes

Therefore, it would take approximately 46.4 minutes for the 80% completion of this first-order reaction to occur. 46.4 minutes.

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The semipermeable membrane is a selective membrane, which allows specific molecules to pass through. In the given question, Tube B will have a high number of dissolved ions.

The answers can be explained as:

(a) The solution and the pure solvent are separated by a semi-permeable membrane, then the osmosis will take place from the region of higher concentration to the lower concentration of the solvent. Tube C will absorb the least amount of water molecules.

(b) The maximum amount of the water molecule dissolved ions will have the highest osmotic pressure. Osmotic pressure is defined as the minimum pressure applied to prevent the backflow of solvent through a semi-permeable membrane.

Thus, tube B will have the maximum amount of dissolved ions.

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The standard Gibbs energy change for the reaction is 3.40 kJ/mol.

To determine the standard Gibbs energy for a reaction, we need to use the Gibbs energy of formation values for the reactants and products involved. The standard Gibbs energy of formation (ΔG°f) represents the change in Gibbs energy when one mole of a compound is formed from its constituent elements in their standard states, which are typically at 298 K and 1 bar pressure.

The equation provided is not clear, so I'll assume it represents the formation of hydrogen iodide (HI) from its constituent elements hydrogen and iodine (\(I_2\)):

\(H_2(g) + I_2(g) \rightarrow 2HI(g)\)

We can calculate the standard Gibbs energy change (ΔG°) for this reaction using the standard Gibbs energy of formation values:

\(\Delta G^\circ = \sum n \Delta G^\circ_f(\text{products}) - \sum n \Delta G^\circ_f(\text{reactants})\)

\(\Delta G^\circ_f(\text{H}_2(\text{g})) = 0 \, \text{kJ/mol}\) (H2 is the standard state for hydrogen gas)

\(\Delta G^\circ_f(\text{I}_2(\text{g})) = 0 \, \text{kJ/mol}\) (I2 is the standard state for iodine gas)

Substituting the values into the equation:

\(\Delta G^\circ = 2\Delta G^\circ_f(\text{HI}) - \Delta G^\circ_f(\text{H}_2) - \Delta G^\circ_f(\text{I}_2)\)

\(\Delta G^\circ = 2(1.70 \, \text{kJ/mol}) - 0 \, \text{kJ/mol} - 0 \, \text{kJ/mol}\)

\(\Delta G^\circ = 3.40 \, \text{kJ/mol}\)

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Answer:

When nitric acid combine with sodium hydroxide the salt formed is called sodium nitrate. option B

Explanation:

It is the strong acid strong base reaction. When acid and base react with each other salt and water are formed.

In given reaction  nitric acid combine with sodium hydroxide base and form sodium nitrate salt and water.

Chemical equation:

HNO₃(aq) + NaOH(aq)       →      NaNO₃(aq) + H₂O(l)

Ionic equation:

H⁺NO₃⁻(aq) + Na⁺OH⁻(aq)       →      Na⁺NO₃⁻(aq) + H₂O(l)

Net ionic equation:

H⁺(aq) + OH⁻(aq)   →   H₂O(l)

The Na⁺(aq) and NO₃⁻(aq) are spectator ions that's why these are not written in net ionic equation. The water can not be splitted into ions because it is present in liquid form.

Spectator ions:

These ions are same in both side of chemical reaction. These ions are cancel out. Their presence can not effect the equilibrium of reaction that's why these ions are omitted in net ionic equation.  

The following processes which is exothermic in nature is condensation of a gas into a liquid.

Whenever in a reaction which involves releasing energy in the form of heat or light, the process is called an exothermic reaction.

When a matter in a liquid state turns into a solid state (that is, it solidifies) and when a matter in a gaseous state turns into a liquid (it condenses), an exothermic reaction occurs.

The endothermic reaction involves an increase in enthalpy. This mechanism refers to a magnitude whose variation reveals that the level of energy in a thermodynamic system exchanges with the environment.

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The type of bond that would form between atoms of the element iron (Fe) is a metallic bond.

A metallic bond is a form of chemical bonding in which positively charged metal ions are held together in a crystal lattice by their mutual attraction to negatively charged electrons, which are free to move throughout the lattice, creating a sea of electrons. The strength of a metallic bond is determined by the number of electrons in the metal's valence shell that is not tightly bound. Metallic bonding can also be described as a sharing of free electrons between a lattice of positive ions.

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Answer:

The total pressure of three gases is 837.56 mmHg.

Explanation:

The pressure exerted by a particular gas in a mixture is known as its partial pressure. So, Dalton's law states that the total pressure of a gas mixture is equal to the sum of the pressures that each gas would exert if it were alone:

PT = PA + PB

This relationship is due to the assumption that there are no attractive forces between the gases.

In this case, the total pressure can be calculated as:

PT= 2.67 mmHg + 45.69 mmHg + 789.6 mmHg

Solving:

PT= 837.56 mmHg

The total pressure of three gases is 837.56 mmHg.

Rutherford atomic hand drawn model sketched for you

Answer:

315 kg

Explanation:

If the ore is 65% waste material, then the mass of the actual sodium in 1 tonne of ore is:

mass of sodium = 0.35 x 1000 kg = 350 kg

The process of electrolysis separates the sodium from the other components of the ore. The amount of sodium extracted will depend on the efficiency of the electrolysis process, which is typically measured by its Faraday efficiency.

The Faraday efficiency is the ratio of the amount of substance actually produced by electrolysis to the amount predicted by the theoretical stoichiometry of the reaction. For the electrolysis of sodium, the theoretical stoichiometry is:

2 Na+ + 2 e- → 2 Na

This reaction requires 2 moles of electrons (2 Faradays) to produce 2 moles of sodium.

If we assume a Faraday efficiency of 90%, this means that 90% of the theoretical amount of sodium is actually produced by electrolysis. Therefore, the mass of sodium extracted from 1 tonne of ore would be:

mass of sodium extracted = 0.9 x (2/2) x 350 kg = 315 kg

So, the company would extract 315 kg of sodium from 1 tonne of ore that is 65% waste material, assuming a Faraday efficiency of 90%.

Answer:

7500000cm/hr

Explanation:

6km=600000cm

24min=24/60hr=0.4hr

so, according to the question

6k/24km=600000cm÷0.4hr

=1500000cm/hr

therefore in 5 hours we can run:

5×1500000cm/Hr

=7500000cm/hr

A person can run "7,500,000 cm" in 5 hours.

According to the question,

A person can run 6 km in 24 minutes, i.e.,

= \(\frac{6}{24} \ km/min\)

and,

5 hours = 300 minutes

then,

→  A person can run in 5 hours:

= \(\frac{6}{24}\times 300\)

= \(\frac{1800}{24}\)

= \(75 \ km\)

By converting km into cm, we get

= \(7500000 \ cm\)

So the above is the right answer.

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The energy of the wave of frequency 3.78×10¹⁰ Hz is 2.5×10⁻²³ J.

Energy is the ability or the capacity to perform work.

To calculate the energy of the wave, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the energy of the wave is 2.5×10⁻²³ J.

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Solid waste can be disposed by open dumping, landfill and incineration. Here, Incineration system is one of the methods of disposing solid waste. The system utilizes combustion processes to convert solid waste into ash and gases where the ash is later taken to the landfill.

Incineration is considered as a technology for ex situ thermal treatment which is based on the application of high temperature (870–1200 °C) to soil for burning harmful organic chemicals. Metals cannot be destroyed by using this technique. The efficiency of a properly operated incinerator is very high, especially for PCBs and dioxins. Incineration differs from the thermal desorption system in that incineration needs higher temperatures to chemically oxidize or decompose the contaminants, whereas the second method only volatilizes them.

The Advantages of incineration system of solid waste disposal includes:

1. Reduction in the volume of waste ,Incineration reduces the volume of waste to 10% to 20% of its original size.

2. Generation of electricity Incineration plants generate electricity by harnessing the heat energy that is generated by burning solid waste.

The Disadvantages of incineration system of solid waste disposal includes:

1. Production of toxic fumes Incineration of certain materials can lead to the production of toxic fumes such as dioxins.

2.  The installation of incineration plants is quite expensive. The plants require regular maintenance to remain in good working condition. For this reason municipalities and cities that have to bear the cost.

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Answer:

I think solids

Explanation:

sorry if its not right

Considering the definition of mass volume percentage, a mass of NaCl of 45 grams is required to prepare 60ml of a 75% solution.

A mass volume percentage is a ratio of the mass of a solute to the volume of the solution, expressed as a percentage. The mass/volume percentage is calculated as the mass of solute divided by the volume of solution:

mass volume percentage= (mass of solute÷ volume of solution)×100%

In this case, you know:

Replacing in the definition of mass volume percentage:

75% grams/mL= (mass of solute÷ 60 mL)×100%

Solving:

75% grams/mL÷100%= mass of solute÷ 60 mL

0.75 grams/mL= mass of solute÷ 60 mL

0.75 grams/mL×60 mL= mass of solute

45 grams= mass of solute

Finally, a mass of NaCl of 45 grams is required.

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At the end of the era of nucleosynthesis, which lasted from a few minutes to a few million years after the Big Bang, the atomic nuclei present in the universe were primarily hydrogen (about 75%) and helium (about 25%). So the corrrect option is C) hydrogen and helium.

However, as the universe expanded and cooled, the temperature and pressure conditions became too low to allow for further fusion, and the abundance of heavier elements remained relatively small (trace amounts).

This is why the composition of the universe today is dominated by hydrogen and helium, with only small amounts of other elements present.

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Answer:

either h or j

Explanation:

1. The person's body temperature will drop by approximately 5.4°C in three hours.

2. The person will lose approximately 363 kcal of heat by evaporating 625 g of water (sweat) in a day.

3. The person needs approximately 217 liters of oxygen to breathe while sleeping for 6 hours.

1. To calculate the temperature drop, we need to convert the energy loss from kcal/hr to calories and then use the specific heat capacity of the human body. The energy loss in three hours is 90 kcal/hr * 3 hr = 270 kcal. Considering that the specific heat capacity of the human body is approximately 1 kcal/kg⋅°C, the temperature drop can be calculated as 270 kcal / (60 kg * 1 kcal/°C) = 4.5°C. Rounded to the nearest option, the temperature drop is 5.4°C.

2. The heat lost through evaporation can be calculated by multiplying the amount of water evaporated (625 g) by the latent heat of vaporization, which is approximately 0.58 kcal/g. Therefore, the heat loss is 625 g * 0.58 kcal/g = 362.5 kcal. Rounded to the nearest option, the person will lose approximately 363 kcal of heat.

3. To calculate the oxygen requirement, we need to multiply the metabolic rate (60 kcal/hr) by the duration of sleep (6 hours) and divide it by the respiratory quotient of oxygen (approximately 5). Therefore, the oxygen requirement is (60 kcal/hr * 6 hr) / 5 = 72 kcal / 5 = 14.4 liters of oxygen. Rounded to the nearest option, the person needs approximately 217 liters of oxygen.

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Answer:

mathematics is important

The correct answer is D. are made up of at least two substances

The option that give the characteristics of colloids in the question is that they are made up of at least two substances

Therefore, the last option among the given options is correct.

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